language: cpp
dist: focal
jobs:
  include:
    - os: linux
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
            - sourceline: 'deb https://apt.kitware.com/ubuntu/ focal main'
              key_url: 'https://apt.kitware.com/keys/kitware-archive-latest.asc'
          packages:
            - g++-4.9
            - cmake
      env:
        - MATRIX_EVAL="CC=gcc-4.9 && CXX=g++-4.9"
    # works on Precise and Trusty
    - os: linux
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
            - sourceline: 'deb https://apt.kitware.com/ubuntu/ focal main'
              key_url: 'https://apt.kitware.com/keys/kitware-archive-latest.asc'
          packages:
            - g++-5
            - cmake
      env:
        - MATRIX_EVAL="CC=gcc-5 && CXX=g++-5"

    # works on Precise and Trusty
    - os: linux
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
            - sourceline: 'deb https://apt.kitware.com/ubuntu/ focal main'
              key_url: 'https://apt.kitware.com/keys/kitware-archive-latest.asc'
          packages:
            - g++-6
            - cmake
      env:
        - MATRIX_EVAL="CC=gcc-6 && CXX=g++-6"

    # works on Precise and Trusty
    - os: linux
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
            - sourceline: 'deb https://apt.kitware.com/ubuntu/ focal main'
              key_url: 'https://apt.kitware.com/keys/kitware-archive-latest.asc'
          packages:
            - g++-7
            - cmake
      env:
        - MATRIX_EVAL="CC=gcc-7 && CXX=g++-7"
      # Clang on Linux
      # works on Precise and Trusty
    - os: linux
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
            - llvm-toolchain-precise-3.6
            - sourceline: 'deb https://apt.kitware.com/ubuntu/ focal main'
              key_url: 'https://apt.kitware.com/keys/kitware-archive-latest.asc'
          packages:
            - clang-3.6
            - cmake
      env:
        - MATRIX_EVAL="CC=clang-3.6 && CXX=clang++-3.6"

    # works on Precise and Trusty
    - os: linux
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
            - llvm-toolchain-precise-3.7
            - sourceline: 'deb https://apt.kitware.com/ubuntu/ focal main'
              key_url: 'https://apt.kitware.com/keys/kitware-archive-latest.asc'
          packages:
            - clang-3.7
            - cmake
      env:
        - MATRIX_EVAL="CC=clang-3.7 && CXX=clang++-3.7"

    # works on Precise and Trusty
    - os: linux
      addons:
        apt:
          sources:
            - ubuntu-toolchain-r-test
            - llvm-toolchain-precise-3.8
            - sourceline: 'deb https://apt.kitware.com/ubuntu/ focal main'
              key_url: 'https://apt.kitware.com/keys/kitware-archive-latest.asc'
          packages:
            - clang-3.8
            - cmake
      env:
        - MATRIX_EVAL="CC=clang-3.8 && CXX=clang++-3.8"

    # works on Trusty
    - os: linux
      addons:
        apt:
          sources:
            - llvm-toolchain-trusty-3.9
            - sourceline: 'deb https://apt.kitware.com/ubuntu/ focal main'
              key_url: 'https://apt.kitware.com/keys/kitware-archive-latest.asc'
          packages:
            - clang-3.9
            - cmake
      env:
        - MATRIX_EVAL="CC=clang-3.9 && CXX=clang++-3.9"

    # works on Trusty
    - os: linux
      addons:
        apt:
          sources:
            - llvm-toolchain-trusty-4.0
            - sourceline: 'deb https://apt.kitware.com/ubuntu/ focal main'
              key_url: 'https://apt.kitware.com/keys/kitware-archive-latest.asc'
          packages:
            - clang-4.0
            - cmake
      env:
        - MATRIX_EVAL="CC=clang-4.0 && CXX=clang++-4.0"

    # works on Trusty
    - os: linux
      addons:
        apt:
          sources:
            - llvm-toolchain-trusty-5.0
            - sourceline: 'deb https://apt.kitware.com/ubuntu/ focal main'
              key_url: 'https://apt.kitware.com/keys/kitware-archive-latest.asc'
          packages:
            - clang-5.0
            - cmake
      env:
        - MATRIX_EVAL="CC=clang-5.0 && CXX=clang++-5.0"
    # GCC on Mac
#    - os: osx
#      osx_image: xcode8
#      env:
#        - MATRIX_EVAL="CC=gcc-4.9 && CXX=g++-4.9"
#
#    - os: osx
#      osx_image: xcode8
#      env:
#        - MATRIX_EVAL="brew install gcc5 && CC=gcc-5 && CXX=g++-5"
#
#    - os: osx
#      osx_image: xcode8
#      env:
#        - MATRIX_EVAL="brew install gcc6 && CC=gcc-6 && CXX=g++-6"
#
#    - os: osx
#      osx_image: xcode8
#      env:
#        - MATRIX_EVAL="brew install gcc && CC=gcc-7 && CXX=g++-7"
before_install:
  - eval "${MATRIX_EVAL}"
  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
      brew update ;
      brew install cmake ;
    fi

script:
  - ci/build.sh